This 2-pack of replacement straws for Foogo? 10-ounce vacuum insulated stainless steel straw bottles offers a great way to replace current straws or to swap out a straw for a clean one between washings. The straws are removable and easy to clean. Each pack includes (2) soft silicone straws and (2) hard straw stems. Compatible with BS535 model only. Product not for use with hot liquids.